diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
index 2fb8242..0e7b42d 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
@@ -7,11 +7,13 @@
 
 namespace Drupal\Core\Field\Plugin\Field\FieldType;
 
+use Drupal\Core\Annotation\Translation;
 use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\FieldItemBase;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\StringTranslation\TranslationWrapper;
 use Drupal\Core\TypedData\OptionsProviderInterface;
 use Drupal\Core\TypedData\DataDefinition;
 
@@ -42,8 +44,10 @@ public static function defaultStorageSettings() {
    * {@inheritdoc}
    */
   public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
+    // Use TranslationWrapper as those can be called during early bootstrap,
+    // before the translation system is ready.
     $properties['value'] = DataDefinition::create('boolean')
-      ->setLabel(t('Boolean value'));
+      ->setLabel(new TranslationWrapper('Boolean value'));
 
     return $properties;
   }
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
index 961eb67..9c81c10 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
@@ -7,9 +7,11 @@
 
 namespace Drupal\Core\Field\Plugin\Field\FieldType;
 
+use Drupal\Core\Annotation\Translation;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Field\FieldItemBase;
 use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\StringTranslation\TranslationWrapper;
 use Drupal\Core\TypedData\DataDefinition;
 use Drupal\Core\TypedData\DataReferenceDefinition;
 
@@ -34,12 +36,14 @@ class LanguageItem extends FieldItemBase {
    * {@inheritdoc}
    */
   public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
+    // Use TranslationWrapper as those can be called during early bootstrap,
+    // before the translation system is ready.
     $properties['value'] = DataDefinition::create('string')
-      ->setLabel(t('Language code'));
+      ->setLabel(new TranslationWrapper('Language code'));
 
     $properties['language'] = DataReferenceDefinition::create('language')
-      ->setLabel(t('Language object'))
-      ->setDescription(t('The referenced language'))
+      ->setLabel(new TranslationWrapper('Language object'))
+      ->setDescription(new TranslationWrapper('The referenced language'))
       // The language object is retrieved via the language code.
       ->setComputed(TRUE)
       ->setReadOnly(FALSE);
diff --git a/core/lib/Drupal/Core/Session/SessionHandler.php b/core/lib/Drupal/Core/Session/SessionHandler.php
index 18dc9b2..e4dc829 100644
--- a/core/lib/Drupal/Core/Session/SessionHandler.php
+++ b/core/lib/Drupal/Core/Session/SessionHandler.php
@@ -78,12 +78,11 @@ public function read($sid) {
 
     // Handle the case of first time visitors and clients that don't store
     // cookies (eg. web crawlers).
-    $session = '';
     $insecure_session_name = $this->sessionManager->getInsecureName();
     $cookies = $this->requestStack->getCurrentRequest()->cookies;
     if (!$cookies->has($this->getName()) && !$cookies->has($insecure_session_name)) {
       $user = new AnonymousUserSession();
-      return $session;
+      return '';
     }
 
     // Otherwise, if the session is still active, we have a record of the
@@ -126,17 +125,13 @@ public function read($sid) {
       if ($user->isBlocked()) {
         $user = NULL;
       }
-      else {
-        $session = $values['session'];
-      }
     }
 
     if (!$user && $values) {
-      // The user is anonymous or blocked. Only preserve two fields from the
+      // The user is anonymous or blocked. Only preserve the timestamp from the
       // {sessions} table.
       $user = new UserSession(array(
-        'session' => $values['session'],
-        'access' => $values['access'],
+        'access' => $values['timestamp'],
       ));
     }
     elseif (!$user) {
@@ -144,7 +139,7 @@ public function read($sid) {
       $user = new AnonymousUserSession();
     }
 
-    return $session;
+    return isset($values['session']) ? $values['session'] : '';
   }
 
   /**